Grouped table

Group by publisher Group by genre
How this page is built the gem renders it — this is all you write

Grouping is a render-time arrangement, like the layout. Add group_by: :publisher — the gem orders by the group key, splits the rows into collapsible groups (chevron in the header) and shows a per-group count. With 120 books, groups start collapsed beyond config.group_collapse_threshold (default 50), opening only the first; the open ones live in ?open=, so a half-expanded view is copy-pasteable.

app/views/groups/index.html.erb 
<%= crud_collection @books, group_by: :publisher %>   <%# belongs_to, enum or a column %>

Read more: Grouping

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Cover Title Author names Genre Price Publisher Active
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— 8
The Dispossessed City 4 Kim Robinson, Margaret Atwood, and Adrian Tchaikovsky Fiction 19.95 € — ✓
The Hidden Archive 22 Becky Chambers, Mary Shelley, and Frank Herbert Fiction 23.21 € — ✓
The Distant Garden 52 Joe Abercrombie and Ursula Le Guin Fiction 36.80 € — ✓
The Dispossessed Forest 64 Liu Cixin Fiction 36.11 € — ✓
The Burning Archive 100 Joe Abercrombie Fiction 24.48 € — ✗
The Broken Forest 104 Octavia Butler and Frank Herbert Fiction 17.49 € — ✓
The Silent Engine 115 Octavia Butler, Margaret Atwood, and Ursula Le Guin Fiction 24.38 € — ✗
The Silent Archive 116 Ted Chiang and Joe Abercrombie Fiction 10.28 € — ✓
Tor Books 6
Ace 5
Orbit 4
The Ancient Garden 43 Frank Herbert, Iain Banks, and Becky Chambers Fiction 42.67 € Orbit ✓
The Distant Engine 46 Margaret Atwood and Ted Chiang Fiction 21.25 € Orbit ✓
The Broken Empire 48 Ted Chiang and Ann Leckie Fiction 30.49 € Orbit ✗
The Distant Station 86 Frank Herbert and Mary Shelley Fiction 12.86 € Orbit ✓
Gollancz 4
DAW 6
The Ancient Winter 3 Joe Abercrombie Fiction 24.81 € DAW ✗
The Endless Station 13 Ann Leckie, Martha Wells, and Ursula Le Guin Fiction 27.05 € DAW ✗
The Ancient Forest 93 Liu Cixin and Kim Robinson Fiction 41.21 € DAW ✓
The Hidden Garden 99 Frank Herbert Fiction 24.11 € DAW ✓
The Burning Empire 118 Kim Robinson, Mary Shelley, and Margaret Atwood Fiction 17.01 € DAW ✗
The Ancient Archive 119 Octavia Butler and Mary Shelley Fiction 21.49 € DAW ✗
Del Rey 2
The Endless Winter 25 Ann Leckie Fiction 41.02 € Del Rey ✓
The Ancient Ocean 53 Martha Wells and Ursula Le Guin Fiction 25.74 € Del Rey ✓
Vintage 8